Woo-Sug Jung

A Bayesian sensor fusion scheme for attitude tracking

Accurate attitude tracking is a vital process in AR/VR applications. To satisfy its stringent requirement, multiple types of sensors, such as IMU and vision sensors, must cooperate, as each type of sensors has its own set of advantages complementing each other. However, fusion of different types of sensors is not a trivial task. We have previously proposed an attitude tracking algorithm using an IMU, which belongs to the category of recursive Bayesian filtering. In this paper, we propose a both theoretically reasonable and practically useful sensor fusion scheme based on Bayesian statistics, to extend and complement our previous algorithm. Implementation of our scheme for an AR application is also successfully done.

The cost effective and secure service platform to enable smart grid service with mobile backhaul network

The service charge and security on network are obstacles to widely enable a smart grid. To overcome those obstacles, we propose the cost effective and secure service platform with mobile backhaul network. Our proposal applies the RoF based CBS (cloud base station) for cost effective mobile network. The RoF based CBS reduces a CAPEX and OPEX for optical link to build up a next mobile network since it can reuse a present optical link or minimize the number of new optical link. We propose the TPHE (Two Phase Hybrid Equalizer) to overcome the technical issue which is distorted the analog signal on optical link. The TPHE has improved 3.0% of measured EVM. Our paper proposes the WSTA (Wi-Fi based Security Tunnel based on Application) for the BGW (Backhaul Gateway) which connect to mobile backhaul network and Wi-Fi. The WSTA manages security tunnels and pipe to overcome the security vulnerability point on Wi-Fi. The WSTA can protect the other security pipe or tunnel except the hacked pipe or tunnel from hacker even though a specific security tunnel or pipe has hacked, since a security tunnel or pipe is independently managed with the other security tunnel or pipe. A security tunnel is managed by application and a security tunnel is tied to the security tunnel.

A cost-effective fault-tolerance control modules using concurrent write method for ATM switching system

We describe a novel duplicated fault tolerance control module using concurrent write for ATM switching system. To implement a fault-tolerance control module, we expand the bus between the main memory and memory controller that we called a memory bus. We devise a special kind of switch to implement it. In our approach, the memory is consists of CWM (concurrent-write memory) and NCM (non-concurrent-write memory). The memory controller is always accessible to NCM but is impossible to access a self-CWM in standby mode. In a duplicated operating mode, a memory controller of an active module has a responsibility for the refresh cycle of the standby memory as well as the self-side memory. When a write transaction to memory happens, it naturally reflects an other-side memory with simultaneously by a concurrent-write channel as well as a self-memory. This control module can be widely applied to a commercial system, which require a cost-effective fault tolerance control module.